Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Date and Time keeps changing

Yeah, I would start with replacing the battery to see if that may help since you can get a new one for just a few dollars. The number is written on the back of the battery for which one to get, but it should be the normal type CR2032 as Dwarf posted above.

A new battery will probably solve your problem. If not I would recommend running security scans. I have read some place (Goggle, virus changing clock). They do this to try and stop you from updating your security programs.

Good point since when the clock changes my McAfee starts to require a renewal and have me jump through some hoops to do it but I noticed if I just reset the clock to current, the renewal notice goes away. What would you recommend as a good security sweep in terms of something like this?

Date and Time - Allow or Prevent Users and Groups from ChangingHow to Allow or Prevent Specific Users and Groups from Changing the Date and Time in Windows
This will show you how to allow or prevent specific users and groups from being able to change the computer date and time in Vista, Windows 7, and Windows 8.
You will need to be an administrator to...

Tutorials

Computer double beeping and changing date and time.Hello. For the last few months almost every time I turn on my computer it will double beep(instead of one beep) and once I get to my desktop the date will go back to January 1st, 2011. If this is not the right spot to put this then please move it.

General Discussion

Time changing, date remains correctAt night, when I power down my Vista desktop, the time gets changed to the wrong time, but the date remains correct. Could this still be the CMOS battery?
Thanks